Apparatus for cutting and mixing sand



AWN;

July 31, 1951 Y A. I. BREDESON 2,562,766

APPARATUS FOR CUTTING AND MIXING SAND- Filed Oct. 14, 1948 i s Sheets-Sheet 1 July 31, 1951 A. I. BREDESON APPARATUS FOR CUTTING AND MIXING SAND 3 Sheets-Sheet 2 Filed Oct. 14, 1948 y 1951 A. L REDEsoN f ,5

APPARATUS FOR CUTTING AND MIXING SAND Filed Oct. 14, 1948 3 Sheets-Sheet 5 Patented July 31, 1951 UNITED STA ES APPAEATUS-YFORJCUTTIN'G AND-MIXING 4 I Klfred firde s'on, v f ApplicationOctober 14,194g, saamasr r: sfoiajimf cl.259-144i--- The present invention relates "to machines known as sand cutters and mixers used in foun' dries in conditioning sand, preparatory to deliv-v ering it into molds. l The primary object of .the invention is'to 'provide a portable machineof the above typewhich shall be extremely simple in construction, easy to:

operate and light in weighti= Another object of the inventionis to provide a machine which will cut andmixmoldingfsand and leave it in a rigid heap in a single operation.

A further object oftheinvention is to 'provide a machine of the above character which isthe cutting and mixing blades to obviate damage thereto and to the machine during ,the operation thereof. l

Other objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings, wherein like reference.

numerals designate corresponding parts throughout the several views, and in which:

Figure 1 is a side elevational view of the new and improved machine;

Figure 2 is a top plan view thereof Figure 3 is an end elevational view from the rear of the machine; I

Figure 4 is an elevational view of one of the members for supporting and driving the cutting and mixing blades. 1

Referring tothe drawings for a more detailed description thereoLthe machine which is generally designated by the reference numeral 5 comprises a body portion having parallel longitudinally extending top members; 6 and l and end members 8 and 9, respectively. Cross members I 0 and II are attached to the members 6 and 1 and side frame members l2 are connected to the end members 8 and 9 and extend forwardly thereof. The front ends of the longitudinal members 6 and I extend downwardly at an angle, as indicated at IS in Figure 1 of the drawings and are connected at their juncture with the side frame members l2.

The cross member ll forms a support for a motor I4, which motor may be driven from any source of power, and the cross member ID forms a bearing or support for a shaft I5. This shaft carries a bevel gear is in mesh with a gear I! driven by the motor l4, and through these gears looking rotation is imparted 'toitheshaft l5. The-shaft is journalled'at each-end in"suitablebearings1-8;;

The free end of the shaft l5 carries a'pulley' I 9 over* which is'trai'ned a belt. 20 tofu-the endless. type. The belt 20 is also trained over a second pulley .2l mounted'on one' 'end'of aishaft 22 which; is carried by'and' between the end-frame members; 8 and 9; The shaft/"221s "square-shaped ini'cross section-andcarries the cutting andmixing'blades: to be hereinafter more 'fully described.

Mounted' on .=.the shaft -22 and maintained;v in spaced:irelationijthereon are the blade vicaurryingmembers. 23; i As shown;in Figure 4 of the, drawings; zthese blade; carrying members 2 3-: are, sub stantially .zsquareeshapedaland arei'lforn'iedwithg-ag cylindrical-shaped, :opening 2-4 for accommodat-x ing theisha'ft '22.; Asia-to b'e;:understo.od,- ithe holes: 274 inthe: bladeecarrying members; is are, largerjrr diameter than the shaft-22.50 thatsaidz shaft,,-when -necessary,.;;can rotatekfreelyythere' 1;; However, means are provided :in Ether for f: spacers ,25 which surround and rotate with the shaft 22 for causing the blade 'carrying members 23 tobe locked to and also-rotate with; the shaft22;

As more particularly shown in Figure 3 'of;;=th e drawings, the spacers-25are-carried by the shaft 22 and when in: position,=fmainta'in the bladercar-rr-ying members 23 a-nd. their'bladeswin spaced re lation. When sufficient tensioneis exerted on theendsof the-spacers; they will firmly lock the'blade carrying members 231011;. =the:shafta22 to cause the' -latterto normally rotatewith the shaft :22. One end of the shaft22 is threadedas indicated at 26 and carries thereon a-.fbolt-- 2:-l,rwasher 2-8;

, upon the individualspacers to cause said spacers to tightlygrip the blade carrying members 23 and thereby rotation of the shaft 22 will effect rotation of the blade carrying members 23.

As indicated in Figure 4 of the drawings, each member 23 carries four blades supported adjacent each corner of said member and held thereon by means of rivets or the like 30. The blades are arranged so as to be alternately cutting and mixing blades. For example, the blade 3| is a cutting blade and the blade 32 is a mixing blade. By referring to Figures 2 and 3 of the drawings, it will be noted that the cutting blades and mixing blades difi'er structurally. Each blade is L-shaped. However, the foot portion 33 of the mixing blade 32 is wider than the foot portion 34 of the cutting blade 3|. As is well known, the

supported on "a shaft 36 while the rear of the machine is supported on casters 31 mounted on stub axles 38 which project laterally from the end members 8 and 9. If desired, the front wheels 35 can be eliminated and the front end of the machine attached to a crane or similar device for movement of the machine about the floor of the foundry.

Rigidity to the frame members is afforded by means of cross members 39 and 40 which eX- tend from opposite sides of the machine and are attached to the longitudinal cross pieces 6 and 1.

From the above description when taken in conjunction with the accompanying drawings, it is believed that the operation of the machine is readily obvious. The sand to be mixed prior to placing in a mold is usually to be found in a pile on the floor of the foundry. Applicants machine is readily movable to the location of the sand, and when the motor I! is placed in operation, power will be imparted to the shaft 22 to effect rotation of the cutting and mixing plades 3| and 32 respectively, in the direction of the arrow M, as seen in Figure 1 of the drawings. The amount of tension placed on the spacers 25 will cause the blades to be rotated to cut and mix the sand. However, should suflicient resistance be encountered in the sand by the cutting and mixing blades which might cause damage to the machine, and if such resistance is sufficient to overcome the tension of the spacers 25, the shaft 22 will then rotate freely of the blades. There will thus be in effect a safety slip clutch between the blades and the shaft. As soon as the resistance between the blades and the sand has been overcome, the blades will then be free to rotate with the shaft in the manner previously described.

Should it be deemed necessary, a depth guide 42 may be provided. This depth guide 42 is of angular formation and has one end attached at 43 to the shaft of the caster 31 and its other end attached at '44 to the cross members l2.

It is obvious that many changes may be made in the details of construction without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. In an apparatus for cutting and mixing sand, the combination of a frame including top, side and end members held in assembled relation, a shaft carried by the end member of said frame, a series of cutting and mixing blades loosely mounted on said shaft, spacing means keyed to said shaft for maintaining said blades in spaced relation, yielding spring means for urging said spacing means into frictional engagement with said cutting and mixing blades and motor means carried by said frame for rotating said shaft and blades, said spacing means being arranged to permit relative rotation between said shaft and cutting and mixing blades when said blades encounter 'an overload.

2. In an apparatus for cutting and mixing sand, the combination of a frame including top, side and end members held in assembled relation, a shaft carried by the end member of said frame, said shaft being substantially squareshaped in cross section, a series of plates mounted on said shaft, each of said plates having a circular opening formed centrally thereof and slightly larger in diameter than said squareshaped shaft whereby said shaft may rotate freely on said plates, a series of spacing members keyed to said shaft and arranged between adjacent plates for maintaining said plates in spaced relation on said shaft, cutting and mixing blades carried by said plates, yielding means for urging said spacing members into frictional driving relation with said plates to releasably secure said plates to said shaft and motor means on said frame for rotating said shaft and plates.

3. In an apparatus for cutting and mixing sand, the combination of a frame including top, side and end members held in assembled relation, a shaft carried by the end members of said frame, said shaft being substantially squareshaped in cross section, a series of substantially square plates having a central circular opening mounted in spaced relation on said square-shaped shaft, alternate cutting and mixing blades affixed to the marginal edges of said plate to extend tangentially thereof, spacing means keyed to said shaft for maintaining said plates in spaced relation, yielding spring means for urging said spacing means into frictional engagement with said plates for causing rotation of said plates with said shaft, and motor means carried by said frame for rotating said shaft and the blades.

ALFRED I. BREDESON.

REFERENCES CITED The following references are of record in the 'file of this patent:

UNITED STATES PATENTS 

